Heat exchange roll



Feb. 4, 1969 K, A. a.4 JARREBY 3,425,488

- HEAT EXCHANGE -ROLL y Filed April 17. 1967 sheet of 4 INVENTOR K. A.B. JARREBY HEAT EXCHANGE ROLL Feb. 4, 1969 Sheet Filed April 17. 1967INVENI'OR F eb. 4, 1969 K. A. B. JARREBY HEAT EXCHAQANGE ROLL FiledApril 17,- 196'? Sheet of 4 Fig. 4

Fel* 4f 1969 K. A. a. JARREBY I 3,425,488

HEAT EXCHANGE ROLL Sheet Filed April 17, 1967 l www@ United StatesPatent O 5,777/ 66 U.S. Cl. 165-90 12 Claims Int. Cl. FZSd 11/00; B01d1/22; F28f 5 02 ABSTRACT F THE DISCLOSURE The present invention relatesto a heating or cooling roller having an internal mantle and an externalmantle forming between them an annular space in which a guide rail isarranged to guide the stream of heating or cooling medium along ahelical path in such a way that the effect of the roller is increased.

The present invention has reference to rollers of the kind provided withat least one trunnion and an inlet and an outlet to a space for aheating or cooling medium in liquid or gaseous state, said spacesituated between an external mantle and an interna-l mantle, gasketsarranged between said mantles at the ends of the rollers. So as toobtain a good heat transmission effect between the medium streamingthrough the annular space and the external mantle, there is in the spacearranged a guide ange forcing the medium stream to follow a long paththrough the space.

The purpose of the present invention is to arrange the guide ange insuch a way that there is obtained the best possible heat transmissioneffect and there should also be rendered possible, at need, to changethe external mantle for another without need of a change also of theinternal mantle, the guide flange on the same or the bearing shafttrunnions. The improvement in the invention is to be seen therein thatthere is externally of the internal mantle about the same arranged acarrying layer in which engages the radially inner border of a guiderail arranged edgewise and bent to form a helice, said rail beinginserted between the carrying layer and the external mantle in such away that the latter by the rail is supported at the contact placebetween the mantle and the rail.

At the manufacture of the roller, the internal mantle is according tothe invention externally provided with a preferably heat insulatingcarrying layer for the guide rail which is arranged about the internalImantle in such a way that the radially inner border of the rail engagesthe carrying layer and the helical rail thus formed is given an outerdiameter which to a small extent (e.g. l-3 millimetres) exceeds theinner diameter of the external mantle whereupon the latter is endwiseforced on the guide rail such that the turns of said rail are bentsomewhat in the lateral direction and then with a certain radialpressure abuts internally against the outer mantle. Due to the fact thatthe rail in mounted position with a certain resiliency is pressedagainst the inside of the external mantle the latter will along thewhole of the contact place be supported which makes it possible tochoose, for the external mantle, a sheet thickness which is smaller thanthe one previously needed. Due to the resilient pressing of the railagainst the external mantle there is also obtained a suicient tighteningso as to force the Imedium streaming through said annular space tofollow the windings of the guide rail. The good contact between the railand the external mantle contributes to a good heat transfer from therail to the external mantle or when the roller ice is used as a coolingroller from the external mantle to the rail and the streaming coolingmedium.

According to a preferred embodiment of the invention the carrier layercomprises a helical means which is adapted to be arranged on theinternal mantle and is provided with notches for engagement with theradially inner border of the edgewise arranged guide rail. Preferably,the helical means comprises a hose which after the mounting can beinflated by means of compressed air or be filled with water, oil or thelike. The hose may be provided with a notch reinforced by a metal railand adapted for taking up the radially inner border of the guide rail.

In the following the invention will be elucidated with reference to theattached drawings. In the drawings:

FIG. l shows a longitudinally section side elevation of a rolleraccording to the invention,

FIG. 2 is an end elevation of the roller,

FIG. 3 shows on an enlarged scale a vertical section through one end ofthe roller during its mounting,

FIG. 4 is a side elevation shown partly in section of a roller accordingto another embodiment of the invention,

FIG. 5 shows on an enlarged scale a part of the roller in longitudinalsection, and

FIG. 6 is a perspective view of the external mantle illustrating thearrangement of the guide rail on the helical means.

The roller shown in the drawings is intended to be used as a coolingroller and has an outer diameter of e.g. about 500 millimetres and withwater as cooling medium. The external mantle 1 and the internal mantle 2of the roller are supposed to be manufactured from a rather thin sheet(with a thickness of e.g. 4-6 millimetres) which has been rolled tocylindrical shape with a welded longitudinal joint. The joint is groundafter the welding in such a way that the mantles 1 and 2 be externallysmooth. Alternatively, the mantles may after the welding be exposed to arolling operation in such a way that they be practically completelycylindrical. The shaft trunnions 3 of the roller are attached,preferably by welding, by means of spokes 4 such that the space definedyby the internal and external mantle is in communication therewith. Theshaft trunnions 3 are provided with a bore 5 in communication with theannular space 6 between the mantles 1 and 2 by means of tubes 7 whichalso serve as spokes.

In the space 6 between the mantles 1 and 2 there are at both ends of theroller inserted two transversely slotted `spring rings 8, 9 of differentdiameters and of steel or an analogous material. The greater spring ring8 has an external diameter which only slightly exceeds the innerdiameter of the external mantle 1. The smaller spring ring 9 has aninner diameter which only slightly exceeds the outer diameter of theinternal mantle 2. The surfaces 10 and 11 radially turned towards eachother of the spring rings 8, 9 are conical in such a way that theaxially inner ends of the rings are thicker than their outer ends. Inthe space between the spring rings 8, 9 there is inserted a set ring 12the radially outer and inner surfaces of which are conical with aconicity corresponding to the conicity of the surfaces 10, 11 on thespring rings 8, 9. The set ring 12 is provided with a number of bores 13the axis line of which is parallel to the longitudinal line of theroller. The bores 13 are passed, with a great play, hy bolts 15 providedwith heads 14, said bolts adapted to be screwed into a nut ring 16.Between the nut ring 16 and the spring rings there is arranged a gasket17 of rubber or another suitable elastic material.

There is externally of the internal mantle 2 according to FIGS. 1 and 2arranged a carrying layer 18 of any suitable material having a rathergood supporting capacity and also heat insulation. Such a material maycomprise e.g. synthetic resin which is reinforced by glass fibres.

Such a resin may comprise c g. a polyester resin. This material is woundin strips about the internal mantle in such a way that there is formed arather smooth cylindrical mantle. About this plastic mantle there iswound, arranged edgewise, a strip of steel, preferably of spring steelin such a way that it extends helically from one end of the roller tothe other end of the same. This guide rail 19 is given an externaldiameter which somewhat, e.g. with 1-3 millimetres, exceeds the innerdiameter of the external mantle 1. In the space between two adjacentturns of the guide rail 19 there is arranged a further quantity ofsynthetic resin reinforced by glass fibres such that the rail 19 ywithits radially inner edge 20 is embedded in the carrying layer 18.

At the mounting of the roller, the external mantle 1 is put endwise overthe internal mantle 2 (see FIG. 3) whereat the turns of the guide rail19 are bent somewhat resiliently outwards in lateral direction. When theexternal mantle has been moved to its exact position on the internalmantle 2 (FIG. l) in which position the guide rail with a certain springresiliency is pressed against the inside of the external mantle, thebolts are tightened. The rings 8 and 9 are then caused to expand againstthe external mantle 1 and the internal mantle 2, respectively, and atthe same time there is obtained the necessary tightening at the ends ofthe roller by means of a compression of the gasket rings 17. The coolingmedium flows into bore 5 of one of the shaft trunnions 3 helicallythrough the space 6 between the carrying layer 18 and the externalmantle 1 and out through the opposite shaft trunnion 3. The channeldefined by the carrying layer 18, the guide rail 19 and the externalmantle 1 may be shaped with a rather small cross section so that thestreaming speed of the cooling medium could be kept at a rather highvalue. Due to this and the good contact between the guide rail 19 andthe external mantle 1, the heat transfer to the cooling medium will begood.

lFor a change of the outer mantle 1, the latter is pushed off in thesame direction as it is put on the internal mantle 2.

According to the embodiment shown in FIGS. 4-6 the carrying layer 18 maycomprise helical means 21. These means 21 may comprise rings laidagainst each other or as shown in FIG. 6 a helically wound hose which isarranged on the internal mantle 2. The guide rail 19 abuts with itsradially inner edge 20 in a notch 22 in the helical means 21 (the hose).The notch 22 is preferably reinforced by means of a metal rail 23 with aU-shaped cross section. With its radially outer border 24 the rail 19 isinserted in a helical notch 25 at the inside of the external mantle 1.

At the mounting one proceeds in the following manner (in this connectionsee in particular FIG. 6). First the guide rail 19 is screwed into theexternal mantle 1 and thereupon the helical hose 26 is screwed in such away therein that the rail 19 catches with its radially inner edge intothe notch in the hose. The hose 26 has at the mounting preferably nointernal pressure but is released such that the internal mantle caneasily be pushed in. By means of an inflating valve 27 (see FIG. 5) theinterior 28 of the hose 26 is `filled with a pressure medium, eg.compressed air or an hydraulic medium, such as water or oil. The notch22 is then pressed with the reinforcement rail 23 against the radiallyinner edge 20 of the guide rail 19 and the latter is in turn pressedwith its radially outer edge 24 against the external mantle 1 such thatthe latter is given a better internal support. Due to this pressingthere is obtained also a better tightening at the outer edge 24 as wellas the inner edge 20 of the rail 19 in such a way that the mediumstreaming through the space 2t) is forced to follow the helical pathformed by the guide rail 19 between the mantlcs 1 and 2. No leakingoccurs between the different turns of the path. So as to ensure thecorrect position of the helical turns of the hose 26 on the internalmantle 2 one can arrange attachment screws 29 with nuts 30 on the innerend of the screws. It is also possible to obtain, by means of the springrings 9, such a support of the ends of the helical means 21, situated atthe ends of the roller, thereby that all the winding turns of the sameare kept in position on the internal mantle 2 in which case one cable isto be mounted only after the filling with the pressure medium. In thiscase the attachment screws 29 may be dispensed with and the tighteningis facilitated.

The invention has been described in the aforegoing for purposes ofillustration only and is not intended to be limited by this descriptionor otherwise except as defined in the appended claims. Thus, thedifferent parts of the roller may be modified in many ways withoutdeparture from the inventive idea. On the drawings the roller is shownas provided with only one guide rail 19. However, many such may beemployed in which case many channels will extend helically inside theexternal mantle 1. lInstead of a steel or a metal, a strip of aresilient synthetic resin, e.g. polyethylene, may be used as a materialfor the guide rail 19. The carrying layer 18 can be shaped also ofrubber. Of course, the invention may also be carried into effect byheating rollers in which the heat transmitting medium may comprise hotwater or steam. For the helical means 21 it is possible to choose asmaterial rubber of car tire quality or of a hardness which is somewhatgreater than of such a quality, e.g. 70 shore. Further, one may also usesome kind of a synthetic rubber which in many a case with advantage maybe reinforced by glass fibres. The helical means must not be hollow butsuch a shape facilitates the mounting as the means in released state arethen easier to insert in correct position.

What I claim is:

1. A roller comprising an external mantle, an internal mantle spacedfrom said external mantle to form an annular space between said mantles,an inlet and an outlet to said space for a medium in liquid or gaseousstate streaming through said space, a guide rail located in said spacefor guiding said medium through said space, a carrying layer for saidrail arranged externally on said internal mantle in engagement with theradially inner edge of said guide rail, said guide rail extendingbetween said carrying layer and said external mantle to support saidexternal mantle.

2. A roller as set forth in claim 1 wherein said rail is helical.

3. A roller as claimed in claim 1 wherein said guide rail is a strip ofsteel.

4. A roller as claimed in claim 1, wherein said guide rail is a strip ofresilient synthetic resin.

5. A roller as claimed in claim 1, wherein said carrying layer is asynthetic resin.

6. A roller as claimed in claim 5 wherein said resin is reinforced byglass fibres.

7. A roller as claimed in claim 1, wherein said carrying layer isrubber.

8. A roller as claimed in claim 1, wherin said carrying layer comprisesa helical means arranged on said internal mantle having notches forengagement with the inner edge of said guide rail.

9. A roller as claimed in claim 8 wherein said helical means is hollowand infiatable.

10. A roller as claimed in claim 8, wherein said helical means comprisesa hose.

11. A roller as claimed in claim 10 wherein said hose has a notch, ametal rail reinforcing said notch, said notch engaging the radiallyinner edge of said guide rail.

12. A roller as claimed in claim 1, wherein said external mantle isprovided on the inside with a helical notch for engagement with theradially outer edge of said guide rail.

(References on following page) 5 6 References Cited ROBERT A. OLEARY,Primary Examiner. UNITED STATES PATENTS T. W. STREULE, JR., AssistantExaminer. 1,583,333 5/1926 Bigum 165-91 2,498,662 2/1950 Euby 16S- 89U-S- Cl- XR 2,915,292 12/1959 Gross 165-89 159-11

